Synthesis and Electroluminescence Properties of Deep Blue Materials Based on Anthracene Core

Using anthracene as the basic unit of triplet-triplet annihilation（TTA）blue light materials，two donor-acceptor deep blue TTA materials 4-（10-（dibenzo［b，d］thiophen-4-yl）anthracen-9-yl）benzonitrile（2）and 4-（10-（dibenzo［b，d］thiophen-2-yl）anthracen-9-yl）benzoni-trile（3）were designed and synthesized by introducing dibenzothiophene，a weak electron-donating group，and benzonitrile，a weak electron-withdrawing group into the 9th and 10th positions of anthracene，respectively. Their thermal stability，electrochemical properties，photophysical properties and electroluminescent properties were systematically characterized. The photoluminescence peaks of the two compounds are located at 445 nm and 451 nm，and the photoluminescence quantum yields are 40. 2% and 57. 9%，respectively. The electroluminescent peaks of the undoped devices based on compounds 2 and 3 are located at 448 nm and 458 nm，respectively，realizing deep blue light emission. The two devices have good luminous efficiency，and their maximum current efficiency is 4. 2 cd·A-1and 6. 9 cd·A-1，respectively. The maximum power efficiency is 2. 3 lm·W-1 and 3. 6 lm·W-1，and the maximum external quantum efficiency is 3. 8% and 5. 6%，respectively. Even at the brightness of 1 000 cd·m−2，the external quantum efficiency of the two devices remains at 3. 7% and 5. 4%，showing a very low efficiency roll-off. © 2024 Editorial Office of Chinese Optics. All rights reserved.